A step-down wireless power transfer converter with center-tapped pickup windings is proposed in this article. The pickup winding is split into two sections and only one is connected to the load. This topology is more suitable for low-voltage level applications, such as consumer electronic products. Like the conventional series–parallel compensation technique, the circuit does not induce high circulation current at the transmitter coil under light load operation. The loosely coupled coils are analyzed with mutual inductance model; in addition, the input impedance and voltage gain are derived. The input impedance is proportional to the load impedance, and the voltage gain is less sensitive to the load variation. The proposed topology performs better than the conventional one at higher load conditions, especially when the coupling is poor. The efficiency of a laboratory circuit reaches 88.8% at best condition and it is higher than 63% ranging from 10- to 100-W load at 10- or 60-mm coil separation.

中文翻译：

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具有中心抽头拾波绕组的感应功率传输转换器

本文提出了一种带有中心抽头拾波绕组的降压无线电力传输转换器。拾波绕组分为两部分，只有一个连接到负载。这种拓扑更适合低电压等级的应用，例如消费电子产品。与传统的串并联补偿技术一样，该电路在轻载运行时不会在发射器线圈处感应出高循环电流。用互感模型分析松耦合线圈；此外，还推导出输入阻抗和电压增益。输入阻抗与负载阻抗成正比，电压增益对负载变化不太敏感。在较高负载条件下，尤其是耦合较差时，所提出的拓扑比传统拓扑表现更好。